Table 2

Neuropsychological tests by domain of function

	Bay Bridge welders (n = 43)
	n	Mean	SD	Prevalence (%) of impairment
CATSYS, computer assisted tremor analysis system; VCI, Verbal Comprehension Index; WAIS-III, Wechsler Adult Intelligence Scale; WRAT, Wide Range Achievement Test 3; WMS III, Wechsler Memory Scale.
IQ
Full IQ	35	95.26	12.93	20
Performance IQ	41	94.49	13.67	17.1
Verbal IQ	35	93.69	14.17	22.9

Cognitive flexibility and executive functioning
Stroop colour/word T score	42	39.76	13.40	45.2
Rey-Osterreith copy	43	30.60	3.73	69.8
Design fluency—total correct	41	10.24	2.84	9.8
Design fluency—percent design accuracy	41	8.73	2.69	24.4
Design fluency—switching	41	10.61	2.64	4.9
Sorting—Recognition Description score	37	7.65	2.78	43.2
Sorting—recognition v free sorting	37	7.30	3.15	35.1

Information processing speed
Stroop colour T score	42	38.98	10.59	45.2
Stroop word T score	42	39.10	11.80	40.5

Working memory/attention and concentration/learning
WAIS-III WMI	40	90.6	13.24	25
Digit span	41	8.44	2.37	26.8
Digit span—longest digits (forward)	41	6.1	1.43	17.5
Digit span—longest digits (backward)	41	4.22	1.01	27.5
Letter–number sequencing	40	8.38	3.04	32.5
WMS-III Auditory Immediate Memory Index	37	90.32	13.59	32.4
Logical memory I	37	7.97	3.14	43.2
Verbal paired associates I	37	8.65	2.19	18.9
Word lists 1 recall	36	7.78	3.34	44.4
Auditory consonant trigrams 3″	43	10.16	3.27	51.2
Auditory consonant trigrams 9″	43	7.86	3.25	55.8
Auditory consonant trigrams 18″	43	6.28	3.31	48.8
Rey–Osterreith immediate recall	43	38.79	13	46.5

Memory
WMS-III Auditory Delayed Index	36	94.03	12.61	13.9
Verbal paired associates II	37	8.86	2.52	18.9
Word lists 2 recall	35	9.57	3.38	22.9
Rey–Osterreith delayed recall	43	39.02	13.18	60.5

Visuomotor tracking speed
WAIS-III PSI	42	89.52	11.99	33.3
Digit symbol coding	42	7.79	2.37	31
Trail Making Test A T score	42	44.43	11.78	31

Verbal skills
WAIS-III VCI	35	95.11	15.53	17.1
WRAT3-reading	34	93.65	13.91	23.5
Comprehension	41	8.78	2.92	24.4
Similarities	35	8.71	3.56	28.6
Vocabulary	37	8.62	3.12	35.1
Information	35	9.94	2.71	17.1

Motor dexterity and strength
Grooved pegboard T score (dominant hand)	43	53.93	12.27	14
Finger tapping Tscore (dominant hand)	43	46.42	13.76	23.3
Dynamometer T-score (dominant hand)	42	35.33	8.36	52.4
Santa Ana pegboard (dominant hand)	43	21.89	3.83	97.7

Tremor/postural sway
Parallel Line Test	43	2.12	1.22	90.7
CATSYS Tremor: Harmonic Index (right)	39	0.15	0.11	38.5
CATSYS tremor: Harmonic Index (left)	39	2.32	0.56	61.5
CATSYS sway 4: sway intensity	35	8.84	5.11	51.4